struts2 - Data collection form inputs hidden Struts 2 -

my problem happens when send data hidden fields action. no data collected , result page receive following message:

• error setting expression 'idplatos' value '[ljava.lang.string;@354c0a31'
• error setting expression 'idrestaurantes' value '[ljava.lang.string;@4786b9ce'

in form value of hidden fields come previous query, on same page query other data not in form displayed correctly.this code form:

<s:form action="detalles.action" namespace="/" method="post">         <s:hidden name="idplatos" value="idplatos"/>         <s:hidden name="idrestaurantes" value="restaurante.idrestaurante"/>         <s:submit key="detalles" align="center"/> </s:form> 

this code action:

public class platoaction extends actionsupport {  private arraylist <platos> detalles; private int idplatos; private int idrestaurantes;  public string execute() throws exception {      platos plato = new platos();     restaurantes restaurante = new restaurantes();      plato.setidplatos(getidplatos());     restaurante.setidrestaurantes(getidrestaurantes());      system.out.println("idpla");     system.out.println("idpres");  interfaceplatosdao platosdao = factoriadao.getplatosdao("mysql"); detalles = platosdao.detalleplato(plato, restaurante);  return success; }  public arraylist<platos> getdetalles() {     return detalles; }  public void setdetalles(arraylist<platos> detalles) {     this.detalles = detalles; }  public int getidplatos() {     return idplatos; }  public void setidplatos(int idplatos) {     this.idplatos = idplatos; }  public int getidrestaurantes() {     return idrestaurantes; }  public void setidrestaurantes(int idrestaurantes) {     this.idrestaurantes = idrestaurantes; } } 

what problem?